Posts made by Nvigr8

@stephen6309 Thanks for the confirmation.

Hello all. On my printer I use different swappable heads, each with its own BLTouch. One for 0.8 nozzle, one for 0.6 and one for dual 0.4 nozzles. I would like to have a different trigger height for each head. In Cura I have each one set up as a different machine. Can I just put the M31 gcode line from the config.g file into the start script for each machine? If that is not the way to do it, would someone please tell me how?

Below is the line of code I'm referring to.

Many thanks.

G31 P500 X-32.62 Y-24.92 Z3

@infiniteloop If can find a drillbit that's close to the diameter of the cylinder that the thermistor head is in, it should fit nicely in with a little thermal paste and a screw placed near the hole so the head overlaps slightly to keep it from coming out. I think...

@infiniteloop I have a Semitec 104GT-2 from an E3D hotend on hand. Any reason that won't work?

@infiniteloop Thanks. I'll give that a try.

@infiniteloop Thank you for the reply. My apologies, I should have clarified. I removed the plug and controller from the heatpad and connected it to the mains on the powersupply and use the Duet board as the controller. Not sure if that makes a difference in regard to your comments.

I agree, moving the thermistor would be much more accurate. I see your point about having it next to the insulated pad. I will do that next. Is there preferred thermistor type here for this situation/?

@stephen6309 Thanks for the reply. I have a flexible build plate on top of the aluminum. It is textured but a little shiny. I'll take the temp again with it off.

I do have the underside fully insulated. Forgot to put that in the specs.

Hello all. I've built myself a new heatbed for my Frankenprinter and having some issues heating it.
Issue: The temp reading from the top of the bed is about 30 degrees less than what is reading on the screen. Top reads 78C with IR thermometer and the controller is commanding 110C.
Bed stats:
16" x 16" x 0.25" aluminum plate with spring steel print surface. .25x.25 magnets imbedded in the plate - no magnetic sheet.
I recycled the heat pad from the original bed which was one of the type that plug into the wall and have an inline temperature controller. I assume it is a 120v heater.
It is now mains powered with a SSR.
The powersupply is MEAN WELL SE-600-24 AC to DC Power Supply, Single Output, 24V, 25 Amp, 600W.
I'm using the code below for the bed heater

M308 S0 P"bedtemp" Y"thermistor" T100000 B3950         
M950 H0 C"bedheat" T0                                  
M307 H0 B0 R0.225 C668.2 D8.04 S1.00            	  
M140 H0                                               
M143 H0 S120                                         

I am wondering if this is just how its going to be with the aluminum plate bed...
or...
Am I using the wrong thermistor code? I don't know what thermistor is imbedded in there. Any suggestions for a different one that would compensate for the 30 degree difference?
Should I switch to a 24v 600W heat mat or something similar?
Should I move the thermistor head elsewhere to get a better reading?
Any help or suggestions will be greatly appreciated.

@nvigr8 Question: If I'm going to switch to a 3/8" 15.75x16.25 aluminum plate will I need to upgrade the Y stepper motor? Right now I'm using a single Nema 17 to drive the Y axis. Will that be powerful enough? Or should I go to two Nema 17's or a single larger stepper? Thanks.

@jens55 Wow! That is so much cheaper than anything else I've found! Thanks for the info! I'm gonna try that route first. Now to peel that giant heat mat off...

@jens55 I totally agree that a precision milled aluminum plate of that thickness would be a much better choice than the cheap, thin sheet that comes stock. However, you are also talking about piece of metal that costs several hundred dollars to procure unfortunately. Personally I was hoping to explore a less expensive alternative.

I am interested in this as well. I've got a printer with a 440x413 bed and a single large heatpad. It does not heat evenly at all. Theres a 20 degree difference between the middle of the plate and edges as well as significant bowing of the bed in the middle where the heat is more concentrated.

The consensus seems to be that using four pads is overall a bad idea.

In that case what is a good idea? What would be the best way to evenly head such a large bed?

With Prusa's new XL printer, he uses a modular approach with numberous tiny heatbeds. Would something like this be possible and if so, how? Using, for instance, a Duet 2 Wifi and a 24V, 25 Amp, 600W power supply?

@phaedrux You were correct. The white wire broke off of the male plug end. Ended up not needing the ! after all. It is working properly now. Thank you for the help there.

@phaedrux Since the BL touch was working early on and now not, it occured to me after I left home that maybe the wires came loose through all the other manipulating I've been doing trying to get the thermistors and heaters working. I'll check them when I get back home after work. If they are seated well and there are no obvious issues, what do you suggest next?

On an older note, I got the heaters and tools all sorted, mostly. I added a mains powered bed (which isn't working yet - maybe the SSR) and accordingly bed heater in the configurator. Now the other two tools are showing as well.

At first the thermistor for nozzle 1 was showing wacky numbers and naturally the heater was faulting. I realized this morning that somewhere along the way I switched to PT100 thermistors and forgot about it...very old printer. At lunch I switched back to a standard E3D thermistor and now it appears to be working!

Just gotta get the BLtouch working now then the bed.

@stephen6309 Ok, I'm at home and I added that !. Now M119 shows the Z is not stopped.

Next problem is that when I home the Z axis, the probe deploys but when pushed in, it does not register as a stop. Ideas?

@stephen6309 Thanks again for the help. However, when I first made this post and put in the config.g it WAS working. It was the ONLY axis working at the time. In trying to fix other problems - tools, thermistors, etc. I must have changed something to make it not work. That line you referenced earlier apparently didn't change though.

I just wanted to give a little more context. I will still try your suggestion when I go home for lunch.

; Configuration file for Duet WiFi (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Wed Jan 05 2022 21:06:25 GMT-0600 (Central Standard Time)

; General preferences
M575 P1 S1 B57600                                      ; enable support for PanelDue
G90                                                    ; send absolute coordinates...
M83                                                    ; ...but relative extruder moves
M550 P"Multoo"                                         ; set printer name

; Network
M552 S1                                                ; enable network
M586 P0 S1                                             ; enable HTTP
M586 P1 S0                                             ; disable FTP
M586 P2 S0                                             ; disable Telnet

; Drives
M569 P0 S0                                             ; physical drive 0 goes backwards
M569 P1 S0                                             ; physical drive 1 goes backwards
M569 P2 S1                                             ; physical drive 2 goes forwards
M569 P3 S1                                             ; physical drive 3 goes forwards
M569 P4 S1                                             ; physical drive 4 goes forwards
M584 X0 Y1 Z2 E3:4                                     ; set drive mapping
M350 X16 Y16 Z16 E16:16 I1                             ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E400.00:400.00               ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00:120.00             ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E2100.00:2100.00        ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00:250.00             ; set accelerations (mm/s^2)
M906 X1300 Y1300 Z1300 E450:450 I30                    ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                                ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                                       ; set axis minima
M208 X420 Y410 Z470 S0                                 ; set axis maxima

; Endstops
M574 X1 S1 P"!xstop"                                   ; configure switch-type (e.g. microswitch) endstop for low end on X via pin !xstop
M574 Y1 S1 P"!ystop"                                   ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin !ystop
M574 Z2 S2                                             ; configure Z-probe endstop for high end on Z

; Z-Probe
M950 S0 C"exp.heater3"                                 ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000                    ; set Z probe type to bltouch and the dive height + speeds
M558 H30                                               ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
G31 P500 X-32.69 Y-31.88 Z2.5                          ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20                               ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950         ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                                  ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00                                       ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                                ; map heated bed to heater 0
M143 H0 S120                                           ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                                   ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                                       ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S295                                           ; set temperature limit for heater 1 to 295C
M308 S2 P"e1temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 2 as thermistor on pin e1temp
M950 H2 C"e1heat" T2                                   ; create nozzle heater output on e1heat and map it to sensor 2
M307 H2 B0 S1.00                                       ; disable bang-bang mode for heater  and set PWM limit
M143 H2 S295                                           ; set temperature limit for heater 2 to 295C

; Fans
M950 F0 C"fan0" Q500                                   ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                         ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                                   ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1:2 T45                                    ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                                       ; define tool 0
G10 P0 X0 Y0 Z0                                        ; set tool 0 axis offsets
G10 P0 R0 S0                                           ; set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 H2 F0                                       ; define tool 1
G10 P1 X0 Y0 Z0                                        ; set tool 1 axis offsets
G10 P1 R0 S0                                           ; set initial tool 1 active and standby temperatures to 0C

; Custom settings
; add for filament sensors
M591 P1 C"e0stop" S1 D0                                ;filament monitor connected to E0 endstop
M591 P1 C"e1stop" S1 D1                                ;filament monitor connected to E1 endstop


; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"     ; set voltage thresholds and actions to run on power loss
T0                                                     ; select first tool

@stephen6309 Ah, good to know. Thank you.

@stephen6309 What does that ! do there to make it work?

@stephen6309 NM, I found it. Thanks! I'll try it out at lunch.

@stephen6309 Which .g file would that be in? Thanks.